They're embarrassed because if they know other girls have bigger boobs than them, they feel like the girls that have bigger boobs are better and more attractive than them. If that's not the case, then maybe they think their boobs are too big. I don't know... You shouldn't be embarrassed about how big your boobs are. 
from boobs its to breast feed babies like any other mamel.
Rumors, other girls and stressing them selves with things like thinking there boobs are to small or they don't like their hair.
They are could boobs boobs are awesome boys like you for them.
for there boobs
absolutely , I love other women's boobs . they are super tasty. I try to do a girls boobs at least a couple of times a month . but do not tell my husband .
No, I prefer B-cup girls.
Yeah but they like boobs more :D
Some girls show off what they have like butt and boobs but its dumb but alot of boys like it
this is a stereotype. not all black guys like girls with big butts. Some prefer big boobs and other features not just the butt
They don't. They just like boobs.
Well they're sticking out filled in (like fatty) boobs... like moobies (man boobs) bit can be bigger or smaller